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Add Coat – Adds another Coat layer to the stack.

Base Material – Allows the user to select the base layer material to which the bump/normal effect is added. This slot can be empty in case a transparent base is needed.

Additive Mode – When enabled, causes the  V-Ray Blend Material to behave like a multi-layered Shellac material. Note that this would often result in a physically incorrect material (e.g. a material that reflects more light than falls on it). It is not recommended to use this option unless you know what you are doing. 

Enables/ disables the layer in the stack. Note that this is the layer you add vie the Add Layer button.

Material – Specifies the coat layer material.

Blend – Specifies how much of the final result is contributed by the corresponding coating material, and the rest of the materials below it. If the Blend amount is white, the final result is comprised of the coat material only, and other materials below it are blocked. If the Blend amount is black, a coat material has no effect on the final result. This parameter can also be controlled by a texture map.

Blend Tex Mult – Specifies a multiplier for the amount that the texture is blended with the Blend color.