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We introduce a coarse-grained terrace-step-kink model which includes multispecies steps. The multispecies step system expresses a surface of a complex crystal such as the ice crystal. The surface free energy and the equilibrium crystal shape are calculated. We find that the facet shape is given by an arithmetic mean of those for constituent species. The multispecies system also exhibits the Gruber-Mullins-Pokrovsky-Talapov behavior at the facet edge.
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Yamamoto et al. (1990) studied this question.
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