What is the thinnest orbital wall?

I'm curious, what exactly do you mean by the "thinnest orbital wall"? Are you referring to the thinnest layer of an atom's electron shell, or perhaps a specific structure within an astronomical body like a planet or star? If we're talking about atomic orbitals, it's important to note that the term "wall" isn't typically used to describe the boundaries of these regions. Instead, orbitals are described by their probability distributions, which indicate the likelihood of finding an electron in a particular region of space. As for the thinnest or smallest orbital, that would depend on the specific element and the electron configuration. If we're discussing astronomical orbitals, like those of planets or moons, the concept of a "thinnest wall" isn't directly applicable, as these bodies don't have solid walls in the same sense as terrestrial structures. Could you clarify your question, please?