Layers: An algorithm that peels molecule as layers
Sampling will result in the reduction of surface as shown below in which Sr is varied from default 1.52 to 16 Å.
The following is a test run on Carbohydrate Recognition Domain. (PDB ID: 3ZSJ_A).
You do not need to submit any pdb file, default Sr value is used for test run.
Download link is provided.