1. Institute of Macromolecule Chemistry and Textile Chemistry, Mommsenstrasse 13, 01062 Dresden, Germany, Institute of Polymer Research, Hohe Strasse 6, 01069 Dresden, Germany, Institute of Semiconductor and Microsystems Technology, Nothnitzer Strasse 64, 01062 Dresden, Germany, The Danish Polymer Centre, RISØ National Laboratory, P.O. Box 49, DK-4000 Roskilde, Denmark, and Sector for X-ray and Electron Diffraction, University of Ulm, D-89081 Ulm, Germany