1. Institute of Physics, University of Silesia, ulica Uniwersytecka 4, 40-007 Katowice, Poland
2. Silesian Center for Education
and Interdisciplinary Research, ulica
75 Pulku Piechoty 1a, 41-500 Chorzow, Poland
3. Institute of Material
Science, Univeristy of Silesia, ulica 75 Pulku Piechoty 1a, 41-500 Chorzow, Poland