The simultaneous reflexion by two lattice planes (with indices h and h ') in electron diffraction has been treated by the dynamical theory in order to investigate how it is influenced by the phases of structure amplitudes. For convenience of treatment, a modified formulation of the theory has been developed using particular cross sections of the dispersion surface in reciprocal space. Applying the theory to a lamellar crystal, it was proved that the intensities of transmitted and diffracted waves depend in a relatively simple way on the value of \(|hh'|{=}|φₕ-φh'+φh'-h|\), where ϕ h , ϕ h ' , and ϕ h '- h are the phase angles of structure amplitudes for the indices h , h ', and h '- h . It was shown that the phase effect can be most easily demonstrated by observing fine structures of reflexion spectra which are obtained by rotating the crystal in a specified manner. The determination of the value of \(|hh'|\) is most simple when the coupling reflexion h '- h is strong compared with the reflexions h and h ', and the crystal is centrosymmetric.
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K. Kambe (1957) studied this question.