diff -u -r1.4 -r1.5
--- Layer.java	21 Jun 2005 04:12:48 -0000	1.4
+++ Layer.java	23 Jun 2005 19:12:01 -0000	1.5
@@ -57,6 +57,22 @@

         return thickness;
     }
     

+    public double getThicknessToSensitive()
+    {
+        int i = findIndexOfFirstSensitiveSlice();
+        
+        double thickness = 0.;
+        
+        if ( i != -1) {
+            
+            for ( int ii = 0; ii < i; ii++) {
+                thickness += slices.get(ii).getThickness();
+            }                        
+        }
+        
+        return thickness;
+    }
+    

     public LayerSlice getSlice(int idx) {
         if ( idx > slices.size() - 1) {
             throw new IllegalArgumentException("LayerSlice idx out of range.");