Anomalous diffraction in thin gold films

Abstract
STEM microdiffraction is used to study the structure of polycrystalline thin gold films grown at room temperature on a NaCl substrate. Individual grains were diffracted in regions having a lateral resolution of 120-400 Å.The patterns show anomalous spots which can be indexed in terms of a hexagonal net. A number of zone axes of the hexagonal structure are shown. Several possibilities for explaining the forbidden intensities are discussed.