We present an analysis of the electron-energy-loss spectra produced by dipole scattering from lattice vibrations of the p(2×2) and c(2×2) oxygen overlayer on the Ni(100) surface. We conclude that the distance between the oxygen layer and the Ni surface is very much smaller for the c(2×2) overlayer than for the p(2×2), in accord with a recent suggestion by Upton and Goddard.
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Rahman et al. (1981) studied this question.
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