For determination of the films thermal conductivity, the I-V characteristics of both membrane heaters were measured with high resolution and with I sh in the self-heating regime. Here, the membrane heaters act as thermometers at the same time. Using the local derivative, the resistance R sh can be expressed as function of the applied power P sh . R sh (P sh ) shows a linear relation as expected. The intercept of the linear regression of R sh (P sh ) yield the individual thermometer calibration for both membranes. Using this calibration and considering that ∂V /∂I = R(P sh = 0) + 3∆R sh the resistance change ∆R sh (P sh ) can be converted to ∆T sh (P sh ) for both membranes. Linear regression yield the thermal resistance ∂P sh /∂∆T sh for the large and the small membrane (Fig. )). Application of the math given in Völklein et al. and measurements of the empty membrane result in the thermal conductivity of the film.