X-ray reflectivity studies on glass transition of free standing polystyrene thin films T. Miyazaki, R. Inoue, K. Nishida and T. Kanaya Eur. Phys. J. Special Topics, 141 (2007) 203-206 Published online: 29 March 2007 DOI: 10.1140/epjst/e2007-00041-y