I am trying to build fcc 111 surface in the z direction, and using command "lattice fcc 3.92 orient x 1 -2 1 orient y 1 0 -1 orient z 1 1 1". After finished, I find that the fcc 111 surface is not smooth, and some atoms are lost in some places, while extra atoms are added in other places, which makes the surface very ugly. In addition, at the edge of x and y directions, the atom arrangements are also not smooth.
How can I handle this problem? Any help will be appreciated!