Layers Mesh Generator
In order to create a Layers mesh generator which can be assigned to volumes only, follow these instructions:
 Enter a mesh generator Name of your choice
 Enter a Comment possibly
 Select Layers as Mesh Generator Type

Select the Height type for the Layers mesh
generator:
 Either select Definition of all layers
And in the Height of all layers (in meter) field:
Enter the skin depth value in meter
You can compute the skin depth value with the physical characteristics, using the Skin Effect button just at the right
 Or select Definition of first layer
And in the Height of first layer (in meter) field:
Enter the first layer height in meter
Note: For these two cases, the layer(s) height will be applied on the whole volume boundary except for the faces at the periodicity boundary and the symmetry boundary.  Either select Definition of all layers
 Enter the Number of layers (i.e. the number of boundary layers)
 Enter the Geometric progression coefficient of layers (i.e. the growth parameter used between two adjacent layers)

Enter the Dominant element type in remaining
volume
 Either select Tetrahedron (i.e. the remaining volume is filled with tetrahedra)
 Or select Hexahedron (i.e. the remaining volume is filled with a mixture of hexahedra, pyramids and tetrahedra)