1. Department of Engineering Physics and Mathematics, Helsinki University of Technology, P.O. Box 2200, FIN-02015 HUT, Espoo, Finland; Department of Physics, University of Helsinki, P.O. Box 9, FIN-00014 Helsinki, Finland; Netherlands Organization for Scientific Research (NWO) DUBBLE CRG/ESRF, c/o BP 220, Grenoble F38043, France; Department of Physics, University of Durham, Durham DH1 3LE, UK; and Department of Polymer Science and Materials Science Center, University of Groningen, Nijenborgh 4, 9747 AG...