1. Institute of Macromolecular Chemistry of the Czech Academy of Sciences, Heyrovskeho Nam. 2, 162 06 Prague 6, Czech Republic
2. University of Chemistry and Technology Prague, Technicka 5, 166 28 Prague 6, Prague, Czech Republic
3. Department of Structural Analysis, Institute of Physics of the Czech Academy of Sciences, Na Slovance 2, 182 21 Praha 8, Czech Republic
4. Institute of Materials Research of the Slovak Academy of Sciences, Watsonova 47, 040 01 Kosice, Slovak Republic