X-ray Diffraction XRR: X-ray Reflectivity Spectroscopy GIXD: Grazing Incidence X-ray Diffraction SXRD: Surface X-ray Diffraction GISAXS: Grazing Incidence SAXS GIWAXS: Grazing Incidence WAXS SAXS: Small Angle X-ray Scattering Surface X-ray Diffraction Scattering