  We give a criterion for a flat fibration with affine plane fibers over a
smooth scheme defined over a field of characteristic zero to be a Zariski
locally trivial $\mathbb{A}^2$-bundle. An application is a positive answer to a
version of the Dolgachev-Weisfeiler Conjecture for such fibrations: a flat
fibration $\mathbb{A}^m$ $\rightarrow$ $\mathbb{A}^n$ with all fibers
isomorphic to $\mathbb{A}^2$ is the trivial $\mathbb{A}^2$-bundle.

Algebraic Geometry