Patent ID: 8565379

Claim:
Apparatus for inspection of a sample, comprising: an X-ray source, which is configured to irradiate a location on the sample, which includes one or more thin film layers, with a beam of X-rays; an X-ray detector, which is configured to receive the X-rays that are scattered from the sample and to output a first signal indicative of the received X-rays; a VUV source, which is configured to irradiate the location on the sample with a beam of VUV radiation; a VUV detector, which is configured to receive the VUV radiation that is reflected from the sample and to output a second signal indicative of the received VUV radiation; and a processor, which is configured to process the first signal in order to extract a thickness parameter with respect to one or more of the layers, and to apply the thickness parameter in processing to the second signal in order to derive a characteristic of at least one of the layers.