exfoliate vs overlayer

exfoliate

verb
  • To remove the leaves from a plant. 

  • To remove a layer of skin, as in cosmetic preparation. 

  • To split into scales, especially to become converted into scales as the result of heat or decomposition. 

overlayer

noun
  • A layer of adatoms adsorbed onto a surface, as onto the surface of a single crystal. 

How often have the words exfoliate and overlayer occurred in a corpus of books? (source: Google Ngram Viewer )