1. Deutsches Elektronen‐Synchrotron DESY Notkestr. 85 22607 Hamburg Germany
2. Department of Fibre and Polymer Technology KTH Royal Institute of Technology Teknikringen 56–58 10044 Stockholm Sweden
3. Materials Research Department GSI Helmholtz Center Planckstr. 1 64291 Darmstadt Germany
4. Wallenberg Wood Science Center KTH Royal Institute of Technology Teknikringen 52 10044 Stockholm Sweden