The three-dimensional arrangement of atoms and molecules in crystals and the comparable magnitude of x-ray wavelengths and interatomic distances make it possible for crystals to have more than one set of atomic planes that satisfy Bragg's law and simultaneously diffract an incident x-ray beam - this is the so-called multiple diffraction. This type of diffraction should, in prin- ciple, reflect three-dimensional information about the structure of the dif- fracting material. Recent progress in understanding this diffraction phenome- non and in utilizing this diffraction technique in solid-state...