At perfect interfaces between different materials, interfacial thermal resistances in the range of 10 -9 m 2 K W -1 to 10 -7 m 2 K W -1 are caused by a mismatch in phonon structure. For imperfect interfaces at a macroscopic scale, additional effects such as porosity and surface roughness further enhance this resistance, whereas typical values lie between 10 -6 m 2 K W -1 to 10 - 3 m 2 K W -1 . Using this range of interfacial resistances as guidance, it is found empirically that better agreement between simulation and experiment can be achieved considering a interfacial thermal resistances of 2•10 -6 m 2 K W -1 between the LPSCl and NCM83 domains in the resistor network model (Figure ). This indicates the presence of interfacial thermal resistances between LPSCl and NCM83 providing a physically reasonable explanation for the slower increase of effective thermal conductivity with 𝜑 NCM .