Thickening of a smectic membrane in an evanescent X-ray beam W. H. de Jeu, A. Fera and B. I. Ostrovskii Eur. Phys. J. E, 15 1 (2004) 61-64 Published online: 01 October 2004 DOI: 10.1140/epje/i2004-10034-0