1. Laboratory
for Thin Films and Nanostructures (LABFSN), Department of Chemical
Sciences, University of Catania, Viale Andrea Doria 6, 95124 Catania, Italy
2. Department of Chemistry, University of Florence & INSTM, Via della Lastruccia 3, 50019 Sesto Fiorentino (FI), Italy
3. Department of Physics, University of Milan & CNR-IOM, Trieste, I-34149, Italy
4. Department
of Physics and Astronomy MS 61, Laboratory for Nanophotonics, Smalley-Curl
Institute, Rice University, Houston, Texas 77005, United States
5. Department
of Chemistry and Industrial Chemistry, University of Pisa, Via Moruzzi
3, 56124 Pisa, Italy
6. ICCOM-CNR, Sesto Fiorentino, Florence, I-50019, Italy
7. European Synchrotron Radiation Facility, 71 Avenue des Martyrs, 38000 Grenoble, France
8. Laboratory
for Molecular Surfaces and Nanotechnology (LAMSUN), Department of
Chemical Sciences, University of Catania and CSGI, Viale Andrea
Doria 6, 95124, Catania, Italy