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An acoustic shear surface wave can be guided by the interface of two semi-infinite media in contact if one, at least, of these two media is piezoelectric. After a study of the surface-wave characteristics, the existence conditions are stated. For example, such a wave can propagate along the interface of two identical crystals, in class 6 mm, when the C axes of these crystals, both parallel to the interface and perpendicular to the propagation direction, are in opposite directions.
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Maerfeld et al. (1971) studied this question.
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