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We compare recent computations of dynamical screening at jellium surfaces. Both published results from different groups and new calculations are plotted in a common fashion to exhibit their extent of agreement about qualitative features and quantitative values. A physical picture for a surface-driven Friedel oscillation in the induced density is presented. This particular oscillation is especially strong near the resonance in the d parameter.
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Kempa et al. (1988) studied this question.
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