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Abstract:
RXTE and BeppoSAX observations have yielded evidence for the presence of a power-law component in the spectra of several clusters of galaxies. In clusters with extended regions of radio emission the deduced power-law X-ray emission is likely to be due to relativistic electrons that are Compton scattered by the CMB. The radio and non-thermal X-ray measurements yield the values of the volume-averaged magnetic field and electron energy density in clusters. I will review the observational radio (including Faraday rotation measurements) and X-ray results, and will discuss their direct consequences.