Reflection high energy electron diffraction data collected in the form of an azimuthal plot are analyzed theoretically for the first time. Experimental results for Si(111) at a glancing angle satisfying a Bragg condition are taken from the literature. Calculations are carried out within a multiple scattering approach. Excellent agreement between experimental and theoretical results is achieved. A simple qualitative explanation of the shape of the azimuthal plot analyzed is also presented.

A method for the analysis of x-ray diffraction spectra of metallic superlattices using the Monte Carlo technique is presented. Using 'statistical' model of a nonideal superlattice, computer simulation of X-ray spectra has been carried out. The proposed model takes into account a random distribution of superlattice period, grain thickness and interface thickness. The influence of superlattice parameters on X-ray diffraction patterns is discussed.

It is suggested that measurements and calculations of parameters of reflection high-energy electron diffraction (RHEED) oscillations for off-symmetry azimuths may be helpful in developing a better understanding of RHEED from a growing surface. The phase of RHEED oscillations for Au(111) is analyzed in detail using dynamical diffraction theory. The appearance of the phase shift is believed to be associated with Bragg diffraction preceded and followed by refraction of electrons at the surface. Experimental data for GaAs(001)-2×4 are taken from the literature and an interpretation of the measured oscillation phase is given.