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In view of the renewed interest in surface reflection x-ray topography, a unified theory for the Bragg geometry has been laid out to explain the different types of image formation from the scattering point of view. The means by which the photons “infiltrate” a real crystal have been studied. The theory suggests, for example, a mechanism for image contrast inversion in the Bragg geometry, and will also be found to be important in other topics of high current interest, such as x-ray standing wave surface analysis and x-ray inelastic scattering at the Bragg angle.

X-Ray Extinction Theory in the Bragg Geometry