The following properties do not contain any documentation. Detailed documentation is needed to fully understand how these properties are to be used when generating procedural meshes which are to use 2D sorting layers:

Renderer.sortingLayerName:

http://docs.unity3d.com/Documentation/ScriptReference/Renderer-sortingLayerName.html

Renderer.sortingLayerID:

http://docs.unity3d.com/Documentation/ScriptReference/Renderer-sortingLayerID.html

Renderer.sortingOrder:

http://docs.unity3d.com/Documentation/ScriptReference/Renderer-sortingOrder.html