“…Therefore, the EPR spectrometer is capable to register not only the microwave absorption change, related to spin flip, but also the microwave absorption change, related to sample resistance change, for instance, semiconductor [11,12] or superconductor [13,14]. We examined the peculiarities of the positive microwave absorption in HgSe monocrystal with impurities of Fe of low concentration in weak fields in study [15], while in SdH oscillations appearing area (H > 10 kOe)in study [4]. Results of the study of the microwave absorption in HgSe monocrystal with impurities of Co of low concentration in weak fields are described in article [16].…”