Presently disclosed embodiments relate generally to layers that are useful in imaging apparatus members and components, for use in electrophotographic, including digital, apparatuses. The billing mediation system includes a record receiver, a record correlator, a look ahead cache, a set of buffers, and a session records database. The external magnetic field is changed to calculate the elastic constant corresponding to a change in the external magnetic field for evaluating a concentration of atomic vacancies in the silicon wafer. This conformation causes the sensors to emit a measurable signal. When the check unit indicates an error, the replay unit resets a pointer to reissue the instruction for which the error was detected.