Abstract
We have performed a molecular-dynamics simulation of the peripheral roughening of a two-dimensional triangular lattice on a bcc substrate. The model in which the peripheral atoms exhibit a weakened bond to the inner atoms shows a smooth increase in the roughness as a function of temperature. The dependence of the roughness on the strength of the interaction is in agreement with a theoretical spin model but, however, disagrees with earlier claims based on thermodynamic measurementsn of epitaxial films. The implications for epitaxial growth are also discussed.
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