Patent Number: 
Section: claims

1. An apparatus comprising:a beam generator to generate a charged particle beam towards a specimen to cause electrons and X-rays to emanate from the specimen;an electron detector disposed adjacent to the specimen to detect electrons and their energies emanating from at least a first layer of the specimen;an X-ray detector disposed adjacent to the specimen to detect X-rays having characteristic energies for elements in at a second layer of the specimen; andlogic to receive a first signal from the electron detector and a second signal from the X-ray detector, wherein the logic:performs a first set of data analysis tasks based on the second signal; andaugments a result of the first set of data analysis tasks based on the first signal. 2. The apparatus of claim 1, wherein the logic determines film stack characteristics of the specimen. 3. The apparatus of claim 1, wherein the first layer comprises one or more bottom layers of the specimen. 4. The apparatus of claim 1, wherein the second layer comprises a layer that lies beneath the first layer of the specimen. 5. The apparatus of claim 1, wherein the first signal corresponds to an element and the second signal corresponds to the element. 6. The apparatus of claim 5, wherein the logic selects one of the first signal or the second signal to perform analysis regarding the element. 7. The apparatus of claim 1, wherein the logic comprises a processor coupled to the beam generator, the X-ray detector, and the electron detector. 8. The apparatus of claim 1, further comprising a plurality of X-ray detectors. 9. The apparatus of claim 1, wherein the characteristic energies are measured simultaneously by the X-ray detector and the electron detector. 10. The apparatus of claim 1, wherein the electron detector is to detect Auger electrons emanating from the specimen. 11. The apparatus of claim 1, wherein the specimen comprises a semiconductor wafer. 12. The apparatus of claim 1, wherein the electron detector comprises a cylindrical mirror analyzer. 13. The apparatus of claim 1, wherein the beam generator comprises a scanning electron microscope. 14. The apparatus of claim 1, wherein the beam is configured to penetrate at least two layers of a film stack disposed on the specimen. 15. The apparatus of claim 1, wherein a spot size of the beam directed at the specimen is less than about 100 microns in diameter. 16. A method comprising:directing a charged particle beam towards a specimen to cause X-rays and electrons to emanate from the specimen;detecting electrons and their energies for a first layer of the specimen;generating a first signal in response to detecting of the electrons;detecting X-rays from elements contained in a second layer of the specimen;generating a second signal in response to detecting the X-rays;performing a first set of data analysis tasks based on the second signal; andaugmenting a result of the first set of data analysis tasks based on the first signal. 17. The method of claim 16, further comprising measuring at least one characteristic of a film stack on the specimen. 18. The method of claim 16, wherein detecting the electrons comprises detecting Auger electrons. 19. The method of claim 16, wherein detecting the X-rays comprises detecting X-rays of a specific energy. 20. The method of claim 16, wherein the X-rays are detected from at least one element in a layer of material underneath the first layer.