X-RAY GRAZING-INCIDENCE DIFFRACTION FROM POLYCRYSTALLINE SB FILMS ON SINGLE-CRYSTAL SUBSTRATES

The intensity of Bragg reflections depends strongly on the angle of in cidence, if a highly collimated beam of x-rays is impinging at grazing incidence on a thin (200-600 Angstrom) polycrystalline antimony layer . In the case of asymmetric grazing incidence diffraction (AGID) the a ngle of incidence is small, as the exit angle must be large and nearly twice the Bragg angle. The experimental data are analysed on the basi s of the distorted wave born approximation (DWBA), which yields the th ickness d and the optical constants delta and beta of the layer. These parameters are compared with those determined from total external ref lection data.