Experimentally determined thermal conductivities of a-SiO₂ measured with TDTR when a 65 nm Au transducer layer is used. Solid squares denote the fitted values with temperatures based on calculations that include the Au transducer layer, while solid circles denote the fitted values using temperature rise calculations without including the Au transducer. In both cases, an iterative method was used as described by the inset, whereby input thermal parameters were chosen based on the steady-state temperature rise calculated, the TDTR data were used to fit the a-SiO₂ thermal conductivity and the Au/a-SiO₂ thermal boundary conductance, and all thermal parameters were then used to recalculate the steady-state temperature rise. This process is repeated until convergence is reached. Literature values are taken from Ref. [31].