1. Istituto di Struttura della Materia, CNR, Via Fosso del Cavaliere 100, 00133 Roma, Italy
2. Centre Énergie, Matériaux et Télécommunications, Institut National de la Recherche Scientifique, 1650 Boulevard Lionel-Boulet, Varennes, QC J3X 1S2, Canada
3. Department of Physics, Applied Physics, and Astronomy, Rensselaer Polytechnic Institute, 110 8th Street, Troy, New York 12180, United States
4. Institut Jean Lamour, UMR 7198, Université Lorraine/CNRS, B.P. 239 FE-54506, Vandoeuvre-les-Nancy, France
5. IOM-CNR, Laboratorio TASC, 34149 Trieste, Italy
6. Department of Chemistry and Centre for Self-Assembled Chemical Structures, McGill University, 801 Sherbrooke Street West, Montreal, QC H3A 2K6, Canada
7. Department of Physics and Centro Interdipartimentale Nanoscienze & Nanotecnologie & Strumentazione (NAST), University of Rome “Tor Vergata”, 00133 Roma, Italy