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Typical spectra from experiments involving reflectivity, ellipsometry, attenuated total reflection, and electron energy-loss measurements are calculated for a metal overlayer system. The response is computed in all cases via hydrodynamic models of the electrons' collective motion. Common features of the various spectra are emphasised, in particular the presence of standing plasma waves trapped in the overlayer. Although a quantitative description of these modes is a sensitive function of surface boundary conditions, their appearance is assured by the mere allowance of spatial dispersion. The structure they produce in various spectra is illustrated.
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Schwartz et al. (1984) studied this question.
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