Smectic layering in polyphilic liquid crystals : X-ray diffraction and infra-red dichroism study L. M. Blinov, T. A. Lobko, B. I. Ostrovskii, S. N. Sulianov and F. G. Tournilhac J. Phys. II France, 3 7 (1993) 1121-1139 DOI: 10.1051/jp2:1993187