Does the use of the term “two-dimensional” to describe physical objects bother anyone else? I DON’T CARE if it’s 1 atom thick, that’s still a thickness!
You’ve got a ‘point’ there........................
Not in Solid State Physics. It has bulk properties only in two dimensions, and behaves differently from objects with more than one atom in the thickness dimension.
If we were discussing geometry, you'd be right. We're not, so you're not.
A bit of mental agility is required.