Silicon with a two-dimensional structure

Silicon, a semi-metal, bonds in its natural form with four other elements and its three-dimensional structure takes the form of a tetrahedron. For a long time, it seemed impossible to achieve the synthesis and characterization of a two-dimensional equivalent - geometrically speaking, a square. Now scientists have succeeded in producing a crystalline complex with such a configuration.

from Latest Science News -- ScienceDaily https://www.sciencedaily.com/releases/2021/07/210722120607.htm