Calibration check performed on Oct 2nd

[Simon, Pengbo]

R_surf = AC_surfref/(DC_surfref*P_in*abs_surfref) = 18.1 [1/W]
where AC_surfref = 0.425V, DC_surfref = 3.55V, P_in = 0.030W and abs_surfref = 0.22

R_bulk = AC_bulkref/(DC_bulkref*sqrt(T_bulkref)*P_in*abs_bulkref) = 0.741 [cm/W]
where AC_bulkref = 0.072V, DC_bulkref = 4.2V, T_bulkref = 0.55, P_in = 0.030W and abs_bulkref = 1.04/cm