**Acknowledgement**

The authors acknowledge the financial support of the Russian Foundation for Basic Research (grant no. 09-03-00900-a). The authors thank Prof. S. Nakatsuji (University of Hyogo) and Prof. R. Tamura (Kyoto University) for the provision of paramagnetic probes and Prof. G. K. Elyashevitch for the provision of stretched porous polyethylene films.
