Abstract
Coherent x-ray diffraction from the binary alloy Cu{sub 3}Au has speckled superstructure Bragg reflections due to its antiphase domain structure. For nonspecular superstructure reflections, it is possible to vary the diffraction geometry through a range of incidence and exit angles. Under grazing-exit conditions on a prepared Cu{sub 3}Au(111) thin-film sample, the superstructure speckles are found to become highly elongated and rotated on the detector. A detailed geometrical explanation of this behavior is developed to explain the effect.
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