diff --git a/src/foam/matrices/blockLduMatrix/BlockAMG/BlockMatrixCoarsening/BlockMatrixClustering/BlockMatrixClustering.C b/src/foam/matrices/blockLduMatrix/BlockAMG/BlockMatrixCoarsening/BlockMatrixClustering/BlockMatrixClustering.C
index d7f02cf6c..c5752bba9 100644
--- a/src/foam/matrices/blockLduMatrix/BlockAMG/BlockMatrixCoarsening/BlockMatrixClustering/BlockMatrixClustering.C
+++ b/src/foam/matrices/blockLduMatrix/BlockAMG/BlockMatrixCoarsening/BlockMatrixClustering/BlockMatrixClustering.C
@@ -459,7 +459,7 @@ void Foam::BlockMatrixClustering<Type>::calcClustering()
                     agglomIndex_[rowI] = agglomIndex_[nextGrouped];
                     sizeOfGroups[agglomIndex_[nextGrouped]]++;
                 }
-                else 
+                else
                 {
                     // No group and no solo group.  Make its own group
                     sizeOfGroups[agglomIndex_[rowI]]++;
diff --git a/src/foam/matrices/blockLduMatrix/BlockAMG/BlockMatrixCoarsening/BlockMatrixSelection/BlockMatrixSelection.C b/src/foam/matrices/blockLduMatrix/BlockAMG/BlockMatrixCoarsening/BlockMatrixSelection/BlockMatrixSelection.C
index fb2c84d1b..b9b9389c7 100644
--- a/src/foam/matrices/blockLduMatrix/BlockAMG/BlockMatrixCoarsening/BlockMatrixSelection/BlockMatrixSelection.C
+++ b/src/foam/matrices/blockLduMatrix/BlockAMG/BlockMatrixCoarsening/BlockMatrixSelection/BlockMatrixSelection.C
@@ -34,7 +34,7 @@ Author
 
 #include "BlockMatrixSelection.H"
 #include "coeffFields.H"
-#include "BlockAMGInterfaceField.H"
+#include "BlockSAMGInterfaceField.H"
 #include "coarseBlockAMGLevel.H"
 #include "PriorityList.H"
 #include "crMatrix.H"
@@ -1055,7 +1055,7 @@ Foam::BlockMatrixSelection<Type>::restrictMatrix() const
             coarseInterfaces.set
             (
                 intI,
-                AMGInterface::New
+                SAMGInterface::New
                 (
                     coarseAddrPtr(),
                     coarseInterfaces,
@@ -1067,7 +1067,6 @@ Foam::BlockMatrixSelection<Type>::restrictMatrix() const
         }
     }
 
-    //HJ: Add interface fields
 //------------------------------------------------------------------------------
 //                            CREATE COARSE MATRIX
 //------------------------------------------------------------------------------
@@ -1343,6 +1342,65 @@ Foam::BlockMatrixSelection<Type>::restrictMatrix() const
                 }
             }
         }
+
+        // Get interfaces from coarse matrix
+        typename BlockLduInterfaceFieldPtrsList<Type>::Type&
+            coarseInterfaceFieldsTransfer = coarseMatrix.interfaces();
+
+        // Aggolmerate the upper and lower coupled coefficients
+        forAll (interfaceFields, intI)
+        {
+            if (interfaceFields.set(intI))
+            {
+                const SAMGInterface& coarseInterface =
+                    refCast<const SAMGInterface>(coarseInterfaces[intI]);
+
+                coarseInterfaceFieldsTransfer.set
+                (
+                    intI,
+                    BlockSAMGInterfaceField<Type>::New
+                    (
+                        coarseInterface,
+                        interfaceFields[intI]
+                    ).ptr()
+                );
+
+                // Since the type of clustering is now templated, clustering
+                // of block coefficients must be done by a FIELD (not interface)
+                // via a new set of virtual functions
+                // HJ, 16/Mar/2016
+
+                // Note: in the scalar AMG, clustering is done by the interface
+                // (always scalar) but in the block matrix it is done by a
+                // templated block interface field
+                // HJ, 16/Mar/2016
+
+                // Cast the interface into AMG type
+                const BlockSAMGInterfaceField<Type>& coarseField =
+                    refCast<const BlockSAMGInterfaceField<Type> >
+                    (
+                        coarseInterfaceFieldsTransfer[intI]
+                    );
+
+                coarseMatrix.coupleUpper().set
+                (
+                    intI,
+                    coarseField.selectBlockCoeffs
+                    (
+                        matrix_.coupleUpper()[intI]
+                    )
+                );
+
+                coarseMatrix.coupleLower().set
+                (
+                    intI,
+                    coarseField.selectBlockCoeffs
+                    (
+                        matrix_.coupleLower()[intI]
+                    )
+                );
+            }
+        }
     }
     else
     {
diff --git a/src/foam/matrices/blockLduMatrix/BlockAMG/BlockSAMGInterfaceFields/BlockSAMGInterfaceField/BlockSAMGInterfaceField.C b/src/foam/matrices/blockLduMatrix/BlockAMG/BlockSAMGInterfaceFields/BlockSAMGInterfaceField/BlockSAMGInterfaceField.C
index eed21a98e..ab8a097aa 100644
--- a/src/foam/matrices/blockLduMatrix/BlockAMG/BlockSAMGInterfaceFields/BlockSAMGInterfaceField/BlockSAMGInterfaceField.C
+++ b/src/foam/matrices/blockLduMatrix/BlockAMG/BlockSAMGInterfaceFields/BlockSAMGInterfaceField/BlockSAMGInterfaceField.C
@@ -39,7 +39,7 @@ Foam::BlockSAMGInterfaceField<Type>::selectBlockCoeffs
     (
         new CoeffField<Type>(interface_.size())
     );
-    CoeffField<Type>& coarseCoeffs = tcoarseCoeffs();
+    // CoeffField<Type>& coarseCoeffs = tcoarseCoeffs();
     /* HJ, code missing
     typedef CoeffField<Type> TypeCoeffField;
 
diff --git a/src/foam/matrices/lduMatrix/solvers/AMG/interfaceFields/SAMGInterfaceFields/processorSAMGInterfaceField/processorSAMGInterfaceField.C b/src/foam/matrices/lduMatrix/solvers/AMG/interfaceFields/SAMGInterfaceFields/processorSAMGInterfaceField/processorSAMGInterfaceField.C
index a6d789753..ea74a82f5 100644
--- a/src/foam/matrices/lduMatrix/solvers/AMG/interfaceFields/SAMGInterfaceFields/processorSAMGInterfaceField/processorSAMGInterfaceField.C
+++ b/src/foam/matrices/lduMatrix/solvers/AMG/interfaceFields/SAMGInterfaceFields/processorSAMGInterfaceField/processorSAMGInterfaceField.C
@@ -45,12 +45,12 @@ namespace Foam
 
 Foam::processorSAMGInterfaceField::processorSAMGInterfaceField
 (
-    const SAMGInterface& AMGCp,
+    const SAMGInterface& SAMGCp,
     const lduInterfaceField& fineInterfaceField
 )
 :
-    SAMGInterfaceField(AMGCp, fineInterfaceField),
-    procInterface_(refCast<const processorSAMGInterface>(AMGCp)),
+    SAMGInterfaceField(SAMGCp, fineInterfaceField),
+    procInterface_(refCast<const processorSAMGInterface>(SAMGCp)),
     doTransform_(false),
     rank_(0),
     outstandingSendRequest_(-1),
@@ -58,6 +58,7 @@ Foam::processorSAMGInterfaceField::processorSAMGInterfaceField
     scalarSendBuf_(0),
     scalarReceiveBuf_(0)
 {
+    Pout<< "Creating processor SAMG interface field" << endl;
     const processorLduInterfaceField& p =
         refCast<const processorLduInterfaceField>(fineInterfaceField);
 
diff --git a/src/foam/matrices/lduMatrix/solvers/AMG/interfaces/SAMGInterfaces/processorSAMGInterface/processorSAMGInterface.C b/src/foam/matrices/lduMatrix/solvers/AMG/interfaces/SAMGInterfaces/processorSAMGInterface/processorSAMGInterface.C
index 915512111..769e1e571 100644
--- a/src/foam/matrices/lduMatrix/solvers/AMG/interfaces/SAMGInterfaces/processorSAMGInterface/processorSAMGInterface.C
+++ b/src/foam/matrices/lduMatrix/solvers/AMG/interfaces/SAMGInterfaces/processorSAMGInterface/processorSAMGInterface.C
@@ -56,6 +56,7 @@ Foam::processorSAMGInterface::processorSAMGInterface
     comm_(fineProcInterface_.comm()),
     tag_(fineProcInterface_.tag())
 {
+    Pout<< "Creating processor SAMG interface" << endl;
     /* HJ, Code missing here
 
     // Make a lookup table of entries for owner/neighbour