A method is described for operating a bistable resistance random access memory having two memory layer stacks that are aligned in series is disclosed. The present invention also provides a method of producing the above compound, and a method of producing a perfluoroalkyl radical by using the above compound as a starting material. In this way it is possible, in a sensor fixed to the object, to distinguish the respective contributions of different sources. The direction of the resulting magnetic field is also approximately parallel to the direction defined by the tie line connecting the substrate and the inductively coupled plasma. Therefore, a bored headrest is provided having a high quality of appearance and whose quality of appearance can be kept constant. The precision wireless sensor comprises a wireless transmitter, a wireless receiver with bank of down converters and bank of correlators, a receive signal strength measurement circuit, and a control processor with timing counter.