Tikz arrow with two 90° edges linking two nodes

Question

I would like to draw an arrow pointing from the south of the t node to the south of the e node. The problem is that I have a slight grade in the edge pointing from the first to the second node.

This seems to come from the fact that the height of the arrow isn't considered within my calculation.

Does anybody know how to consider it? Is there a more elegant way to achieve the desired solution?

\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{calc}
\usetikzlibrary{positioning}

\begin{document}
\begin{tikzpicture}
        \node[draw](tID){t};
        \node[draw, right=2.0cm of tID.east](eID){e};
        \draw[->,semithick] (tID.south) -- ($(tID.south) - (0.0,0.5)$) -- ($(eID.south) - (0.0,0.5)$) -- (eID.south);
\end{tikzpicture}
\end{document}