Abstract
In a recent Letter, Mele and Pykhtin [Phys. Rev. Lett. 75, 3878 (1995)] presented a calculation of the surface dynamics of the vicinal Ni(977) surface based on continuum elastic theory that they have used to explain recent inelastic He-atom scattering phonon data obtained by Niu et al. [Science 268, 847 (1995)]. We have calculated the lattice dynamics of this surface in the framework of a microscopic force-constant model that gives the entire surface-phonon dispersion curves and provides detailed insight into the origin and character of the step-localized phonon modes.
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