1. Nano-Engineered Materials & Organic Electronics Laboratory; Umeå University; Umeå 90187 Sweden
2. Polymer Chemistry and Bioengineering; Zernike Institute for Advanced Materials; University of Groningen; Nijenborgh 4 9747 AG Groningen The Netherlands
3. Materials Science Division; Stanford Synchrotron Radiation Lightsource; Menlo Park CA 94025 USA