new syntax

tutorials/mesh/snappyHexMesh/iglooWithFridges/system/snappyHexMeshDict

@@ -244,6 +244,8 @@ snapControls
 // Settings for the layer addition.
 addLayersControls
 {
+    relativeSizes true;
+
     // Per final patch (so not geometry!) the layer information
     layers
     {
@@ -264,7 +266,7 @@ addLayersControls
     //  is the
     //  thickness of the layer furthest away from the wall.
     //  Relative to undistorted size of cell outside layer.
-    finalLayerRatio 0.5;
+    finalLayerThickness 0.5;
 
     //- Minimum thickness of cell layer. If for any reason layer
     //  cannot be above minThickness do not add layer.