The sine-Gordon chain (SGC) is used as a model of the solid-on-solid (SOS) model of a two-dimensional interface. In the SGC model the energy scale for creation of edges (solitons) differs from the energy scale for the creation of disorder. The roughness of a surface and the melting of a surface occur at controllably different temperatures. The SOS and SGC models are compared.
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R. A. Guyer (1979) studied this question.
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