Appendix C. TCR Measurements
The two subsections below show two effects on the TCR measurements, i.e., the effect of thermal annealing during the first temperature cycle and the effect of aging.

Appendix C.1. Thermal Annealing
The graph below is an example of the measured thermal annealing of a metal layer on COC. Here, only the graph for evaporated Au is shown, but all except evaporated Pt show this behavior. Evaporated Pt had some contaminants in the metal track. This is most probably caused by the shadow mask.
Figure A2  Thermal annealing of an evaporated 100 nm Au layer.

Appendix C.2. Aging
The layer analyzed in Figure A2 is stored for two weeks in ambient conditions and the TCR is analyzed again. From the graph it is visible that the aging has some effect on the TCR of the metal layer.
Figure A3  The effect of two weeks aging in ambient conditions on a 100 nm Au layer. The TCR of the as deposited layer is 0.00161 K−1 and the TCR of the two week old layer is 0.00224 K−1.