  For a $p$-adic differential equation solvable in an open disc (in a $p$-adic
sense), around 1970, Dwork proves that the solutions satisfy a certain growth
condition on the boundary. Dwork also conjectures that a similar phenomenon
should be observed without assuming the solvability. In this paper, we verify
Dwork's conjecture in the rank two case, which is the first non-trivial result
on the conjecture. The proof is an application of Kedlaya's decomposition
theorem of $p$-adic differential equations defined over annulus.
