Abstract
It is shown that the theoretical form of the anisotropy of the high-frequency surface resistance of a metal having spheroidal energy surfaces, calculated exactly by Sondheimer, may be obtained also in the extreme anomalous limit by means of the ineffectiveness concept. This result is taken to justify the application of the simpler ineffectiveness method to metals having Fermi surfaces of any form, and it is shown that the resistance is related solely to the geometrical shape of the Fermi surface. The possible application of this result in the study of metals is discussed.

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