Affiliation: | 1. Universität Bayreuth, Experimentalphysik II, D-95440 Bayreuth, Germany;2. Dept. Technical Physics II/Polymer Physics, TU Ilmenau, PO Box 100 565, D-98684 Ilmenau, Germany;3. Institute of Physics, Kazan Federal University, Kazan, 42008 Tatarstan, Russia |