Evolution of area-decreasing maps between two-dimensional Euclidean spaces

We consider the mean curvature flow of the graph of a smooth map $f:{\mathbb{R}}^2\to {\mathbb{R}}^2$ between two-dimensional Euclidean spaces. If $f$ satisfies an area-decreasing property, the solution exists for all times and the evolving submanifold stays the graph of an area-decreasing map $f_t$. Further, we prove uniform decay estimates for the mean curvature vector of the graph and all higher-order derivatives of the corresponding map $f_t$.