Abstract
The number of nearest neighbours of like atoms in an alloyed surface layer is derived from correlation functions of higher order for a square lattice gas with nearest-neighbour attraction and next-nearest-neighbour repulsion. The correlation functions and the position of the phase transition are determined by an extension of the Bethe-Peierls cluster approximation and by Monte Carlo simulation. Qualitative agreement with existing experimental data on the number of nearest neighbours indicates that both interactions are important.
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