The modulation field used in the radio frequency size effect is screened by induced audio frequency currents. The incomplete penetration of the modulation field can be clearly seen in the phase lag of the Gantmakher resonance signal behind the signal due to surface bound states. A comparison of the phase lag as a function of modulation frequency with a simple theory leads to an estimate of the bulk electron mean free path. The influence of modulation field screening on measurements of the phonon limited mean free path and other applications are discussed.
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Awater et al. (1973) studied this question.
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