The relative priority of the layer, expressed as normalised integer range [0..100]. Controls how layers intersect in connections and corners of building elements: a layer from one element protrudes into (i.e. displaces) a layer from another element in a joint of these elements if the former element's layer has higher priority than the latter. The priority value for a material layer in an element has to be set and maintained by software applications in relation to the material layers in connected elements.
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not working for me
@sahrul Try and download these files and try to reverse engineer what's going on...
https://hub.openingdesign.com/OpeningDesign/Visualize_IfcMaterialLayerSets
Print
SECTION - WEST - BUTTED ROOF_no_layers
, and inspect with google chrome, or favorite browser.To download all the files...

thanks @c4rlosdias @theoryshaw
A beautiful wall layer junction — how can it be achieved?

Play around with that value...

From standards...
https://ifc43-docs.standards.buildingsmart.org/IFC/RELEASE/IFC4x3/HTML/lexical/IfcMaterialLayer.htm
Wow..like Archicad
I've tried the ZIP file, but it doesn't work.