1. Department of Physics, University of Trieste, Via A. Valerio 2, I-34127 Trieste, Italy
2. TASC Laboratory, Istituto Officina dei Materiali IOM-CNR, S.S. 14—km 163.5, I-34149 Trieste, Italy
3. Department of Engineering and Architecture, University of Trieste, Via A. Valerio 6/1, I-34127 Trieste, Italy
4. Elettra-Sincrotrone Trieste, Area Science Park, S.S. 14—km 163.5, I-34149 Trieste, Italy
5. Department of Chemical and Pharmaceutical Sciences, University of Trieste, Via L. Giorgieri 1, I-34127 Trieste, Italy
6. DEMOCRITOS National Simulation Center, Istituto Officina dei Materiali IOM-CNR, Via Bonomea 265, I-34136 Trieste, Italy
7. Department of Physics, King’s College London, Strand, London WC2R 2LS, United Kingdom