Dear all, I condtruct a 9 layers surface structure of BaTiO3, and I want to optimize its structure. But when I "run_lapw -fc 1 ", Force converged can be reached. The FGL is large. If i change atoms position by hand, I found the force on atom change without rule. How should I do? Best WANG Yuan Xu wang.yuanxu at nims.go.jp 2004-07-12