Atomically thin != 2D (Score: 1) by firstname.lastname@example.org on 2016-02-16 17:59 (#1450E) Please. Atoms have a size. They are three dimensional. Things made of atoms are not two dimensional. Re: Atomically thin != 2D (Score: 1) by email@example.com on 2016-02-18 08:40 (#14AWN) Dimensionally speaking, yes, it is 3D. Structurally speaking however, it is a 2D arrangement. Just like a matrix.