On the basis of a simple model of a simple cubic crystal, calculations are carried out of the mean-square displacement of an atom in a thin film of L layers bounded by two free (001) surfaces. The results are compared with those for a semi-infinite crystal bounded by a single free (001) surface for atoms at the same distance from the surface. The conditions under which the two sets of results are in essential agreement are established.
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Mazur et al. (1981) studied this question.
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