Layer and Materials for IfcRoof IFC

[SDA]

Hello,

I would like to be able to retrieve information about the material layer of the ifcroof from an IFC model created in Archicad.

I would like to understand why Archicad does not give the layer information for IFCROOF (IFCRELASSOCIATESMATERIAL)

Screenshot 1 is the "IfcRoof" property created from Revit in which we can see that the ifcRoof has the layers information of the materials

Screenshot 2 is the "IfcRoof" property created from Archicad.

Thanking you all in advance