List(List(0,0,0),List(0,0,0),List(0,0,
   (b*fAwxi*fBwxi*gAw*gBw*Nxx)/a + 
    (fAw*fBwxi*gAweta*gBw + fAwxi*fBw*gAw*gBweta)*Nxy + 
    (a*fAw*fBw*gAweta*gBweta*Nyy)/b))
