  A new summability method was tested to calculate the critical exponent $\nu$
of the localization length for the symplectic case derived from the non-linear
$\sigma$-model. Although we used the same series as Hikami and others, unlike
them we were able to resum the series in two-dimensions (2D) and obtain the
result $\nu\sim 1$. Values of $\nu$ in $2+\varepsilon$ dimensions seem to
saturate the Harris inequality up to $\varepsilon=0.2$.
