monolayer

mono- +‎ layer

monolayer (plural monolayers)

1. (chemistry) A layer of material that is one molecule thick
   • 2016, Yuanfeng Xu, Bo Peng, Hao Zhang, Hezhu Shao, Rongjun Zhang, Hongliang Lu, David Wei Zhang, Heyuan Zhu, “First-principle calculations of phononic, electronic and optical properties of monolayer arsenene and antimonene allotropes”, in arXiv‎:

     Recently a stable monolayer of antimony in buckled honeycomb structure called antimonene was successfully grown on 3D topological insulator Bi${\displaystyle _{2}}$Te${\displaystyle _{3}}$ and Sb${\displaystyle _{2}}$Te${\displaystyle _{3}}$, which displays semiconducting properties.

2. (biology) A layer of tissue that is one cell thick