# How to generate configuration of a rough interface with small alloy disorder?

#### PRB147

I want to write a short-line code which can generate some configurations of a rough interface with small alloy disorder.
The problem is stated in the following:
two neighboring interface layer I & II
Layer I is mainly consisted of atom A, but with substitutional disorder, i.e. some sites are
occupied by atom B from the layer II. the concentration of atom B in layer I is small and equal to $$\lambda$$.

The question is how to generate some configurations of this disorder.
Taking a concrete example, If Layer I has $$12\times12=144$$
sites, and $$\lambda=0.05$$.

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"How to generate configuration of a rough interface with small alloy disorder?"

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