"""
Defines "ViscousLayers2D" hypothesis to give parameters of layers of quadrilateral
elements to build near mesh boundary. This hypothesis can be used by several 2D algorithms:
- NETGEN 2D, NETGEN 1D-2D, Quadrangle (mapping), MEFISTO, MG-CADSurf
+ NETGEN 2D, NETGEN 1D-2D, Quadrangle (mapping), MG-CADSurf
Parameters:
thickness: total thickness of layers of quadrilaterals