1. Packaging Materials Department; National Research Centre, Elbuhoth Street 33; Dokki Cairo 12311 Egypt
2. Microwaves Physics and Dielectrics Department; National Research Centre, Elbuhoth Street 33; Dokki Cairo 12311 Egypt
3. Liquid Crystal Institute, Chemical Physics Interdisciplinary Program; Kent State University; Kent Ohio 44242
4. Solid State Physics Department; National Research Centre, Elbuhoth Street 33; Dokki Cairo 12311 Egypt