Patent ID: 7120228

Claim:
Apparatus for analysis of a sample having a surface layer, the apparatus comprising: a radiation source, which is adapted to direct a converging beam of X-rays toward a surface of the sample from a first source location with respect to the sample in which the X-rays impinge on the surface at a grazing angle and from a second source location with respect to the sample at a higher angle than the grazing angle; at least one detector array, which is arranged to sense the X-rays scattered from the sample as a function of elevation angle over a range of elevation angles simultaneously, and to generate output signals responsively to the scattered X-rays, the detector array having a first detector location, in which the detector array senses the X-rays that are reflected from the surface of the sample at the grazing angle while the radiation source is in the first source location, and a second detector location, in which the detector array senses the X-rays that are diffracted from the surface in a vicinity of a Bragg angle of the sample while the radiation source is in the second source location; a motion assembly, which is coupled to move the radiation source between the first and second source locations and to move the at least one detector array between the first and second detector locations; and a signal processor, which is coupled to receive and process the output signals generated by the at least one detector array in the first and second detector locations so as to determine a characteristic of the surface layer of the sample.