It is widely believed that the phenomenon responsible for the familiar peak in the angular dependence of sputtered yields also determines characteristic semiangles a of conical protuberances on sputtered surfaces. It is shown that the magnitude of a depends on details of the process giving rise to the angular minimum rather than the maximum. No accurate measurements of the minimum have yet been made.
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L.T. Chadderton (1977) studied this question.
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