In this second part of the lecture,I will discussion extensions and current issues in measurements by time-domain thermoreflectance: lateral heat flow,two-channel modeling of non-equilibrium effects,spot size and frequency dependence of the apparent thermal conductivity and interface thermal conductance,plasmonic sensing of interfacial heat conduction at solid-liquid/interfaces,and the use of the time-resolved magneto-optic Kerr effect as an alternative to thermoreflectance for sensing temperature changes at the surface of a sample.