CS400 Advanced version has Coating Thickness along with Brick Thickness.
The Software has provision to set Thermal Conductivity of Coating. It is used to calculate the coating thickness.
Clinker conductivity is about 0.467 W/mK for 0 to 700 Deg C, and it increased above 700 Deg C.
The correspondence thickness of the coating is directly proportional to the Thermal Conductivity of the coating.
If you increase the Thermal Conductivity Value of Coating, the calculated Coating thickness will get increase.
If you decrease the Value, the calculated Coating thickness will get decrease.