  Evolution of composition patterns in the annealed, single-crystal surface
alloy film is considered in the presence of the spinodal decomposition, the
compositional stress and the diffusion anisotropy. While the former two effects
contribute to overall phase separation, the anisotropy, correlated with the
surface crystallographic orientation, guides the in-plane formation and
orientation of a pattern. The impacts of the anisotropy parameters on patterns
are systematically computed for [110], [100], and [111]-oriented fcc cubic
alloy surfaces.
