Thermal Analysis of a Coated Component

Hi,

Could anyone share some idea on how to model a Surface Coating. I am using Abaqus Standard for the thermal analysis. For the coating, i tried to create a 'Skin' on the surface and assigned a Homogenous Shell section for the Skin. Is this correct? I couldn't see much difference in the results. Or is there any better way to model a surface coating?

Thanks!!