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Thin films of pyrene in polystyrene matrix have been prepared by spin coating technique. The concentration of polystyrene is kept constant to 1wt.% while that of pyrene dopant varied in the range 2.30x10 -4 -2.30x10 -1 wt.%. Thickness of the films was found to depend upon concentration of pyrene and varies from 90 to 782nm. The results of X-ray diffraction analysis reveal...