facework vs interfacing

facework

noun
  • The material of the outside or front side, as of a wall or building. 

  • The communicative strategies involved in upholding face, or social prestige. 

  • work done at the face, such as the coalface 

interfacing

noun
  • A layer of fabric inserted between other layers of a garment to provide stiffening 

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