Order Followed while Adding Layers in Multi-Layer Shell Conduction Model

What is the order followed while adding layers for the multi-layer shell conduction model (MLS) in Ansys Fluent software?

1) The Multi-layer shell (MLS) conduction model is used to simplify different layers of a thin surface (viz. heat shield) into a single baffle and model all the different layers for shell conduction (thickness, material)

2) The order followed for addition of layers will be:
i. If external surface boundary surface (i.e. mesh on only one side of the surface)
ii. If internal baffle surface (i.e. mesh on both sides of the surface)

3) For a surface with mesh on both sides (baffle surface), a wall will be created by the Ansys Fluent solver on the side with positive normal orientation of that surface. The other side becomes a wall shadow surface.

4) The orientations of surface normals can be checked in Ansys Fluent meshing>display mesh. Layers will be added away from the mesh in the pattern as shown in the attached resolution document. Layers will always be added starting at a wall zone and moving toward the partner wall-shadow zone.

5) For the MLS model, make sure the wall side of the surface is towards the desired position/orientation while adding layers for different materials and thickness. This is the requirement for layers propagated from wall to wall-shadow. If this is not possible, then the normals of the surface can be re-oriented in meshing, or more conveniently, the layers for the MLS model can be added in the reverse fashion, i.e. first layer3, then layer2 and then layer1.

Please have a look at the pdf file attached below for more details.