The Stacks project

Remark 58.23.3. Let $(A, \mathfrak m)$ be a complete local Noetherian ring and $f \in \mathfrak m$ nonzero. Suppose that $A_ f$ is $(S_2)$ and every irreducible component of $\mathop{\mathrm{Spec}}(A)$ has dimension $\geq 4$. Then Lemma 58.23.1 tells us that the category

is equivalent to the category of schemes finite étale over $U_0$. For example this holds if $A$ is a normal domain of dimension $\geq 4$!