  We prove sharpness of quantitative unique continuation results for solutions
of $-\Delta u + W\cdot \nabla u + V u = \la u$, where $\la \in \C$ and $V$ and
$W$ are complex-valued decaying potentials that satisfy $|V(x)| \lesssim
<x>^{-N}$ and $|W(x)| \lesssim <x>^{-P}$. For $M(R) = \inf_{|x_0| =
R}||u||_{L^2(B_1(x_0))}$, it was shown in a companion paper that if the
solution $u$ is non-zero, bounded, and $u(0) = 1$, then $M(R) \gtrsim \exp(-C
R^{\be_0}(\log R)^{A(R)})$, where $\be_0 = max{2 - 2P, (4-2N)/3, 1}$. Under
certain conditions on $N$, $P$, $\la$, and the dimension, we construct examples
(some of which are in the style of Meshkov) to prove that this estimate for
$M(R)$ is sharp. That is, we construct functions $u$, $V$ and $W$ such that
$-\Delta u + W\cdot \nabla u + V u = \la u$, $|V(x)| \lesssim <x>^{-N},$
$|W(x)| \lesssim <x>^{-P}$ and $|u(x)| \lesssim \exp(-c|x|^{\be_0}(\log
|x|)^C)$.
