in heat transfer module comsol software, there are two option namely the highly conductive layer and the pair thin thermally resistive layer that i do'nt know what's application of them
We use the Thin Thermally Resistive Layer node to define the thickness and thermal conductivity of a resistive material located on boundaries. This material can be formed of one or more layers.
We use the Highly Conductive Layer feature to model heat transfer in thin highly conductive layers on boundaries in 2D and 3D. This feature can also be added to 2D axisymmetric models.