Abstract: Thin foil x-ray mirrors are used as the reflecting elements in the telescopes of the x-ray satellites SPECTRUM-X-GAMMA (SRG) and ASTRO-D. High-resolution x-ray scattering measurements from the Au-coated and dip-lacquered Al foils are presented. These were obtained from SRG mirrors positioned in a test quadrant of the telescope structure and from ASTRO-D foils held in a simple fixture. The x-ray data is compared with laser data and other surface structure data such as scanning tunneling microscopy (STM), atomic force microscopy (AFM), transmission electron microscopy (TEM), and electron micrography. The data obtained at Cu K$alpha$-1$/, (8.05 keV) from all the mirrors produced on Al foils shows a scatter that limits the obtainable half power width (HPW) to $GREQ 1.5 arc min. Mirrors based on electroformed Ni foils, however, show local regions with a factor of 4 better performance and they are being developed for future applications. !11
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