Patent ID: 6895075

Claim:
Apparatus for inspection of a sample, comprising: an X-ray source, which is adapted to emit a beam of X-rays so as to irradiate an area on a surface of the sample; a detector assembly, comprising an array of detector elements arranged to receive radiation from the surface due to irradiation of the area by the radiation source and to generate a signal responsive to the received radiation, the array having a first operative configuration for resolving the received radiation along a first axis perpendicular to the surface, and a second operative configuration for resolving the received radiation along a second axis parallel to the surface; X-ray optics, which are adapted to adjust a convergence angle of the beam depending upon whether the array is in the first or the second operative configuration; and a signal processor, which is coupled to process the signal from the detector assembly in the first configuration so as to determine a reflectance of the surface as a function of elevation angle relative to the surface, and to process the signal from the detector assembly in the second configuration so as to determine a scattering profile of the surface as a function of azimuthal angle in a plane of the surface.