  We study the role of anharmonicity at interfaces with an added intermediate
layer designed to facilitate interfacial phonon transport. Our results
demonstrate that while in the harmonic limit the bridge may lower the
conductance due to fewer available channels, anharmonicity can strongly enhance
the thermal conductance of the bridged structure due to added inelastic
channels. Moreover, we show that the effect of anharmonicity on the conductance
can be tuned by varying temperature or the bridge layer thickness, as both
parameters change the total rate of occurrence of phonon-phonon scattering
processes. Additionally, we show that the additive rule of thermal
resistances(Ohms law) is valid for bridge layer thickness quite shorter than
the average bulk MFP, beyond the regime it would be expected to fail.
