The azimuthal dependence of inelastic cross sections for dipole scatterers oriented parallel to a surface is presented. It is demonstrated that a careful choice of experimental parameters and a detailed analysis of data are necessary in order to obtain information about the direction of parallel polarization for a dipole on an ordered surface. Comparison with recent experiments on the Si(111)−2 × 1 surface is made to illustrate this point.
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Alerhand et al. (1986) studied this question.
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