Tensor matrix with linked components.
Rendering
\usepackage{tensormatrix}
$\begin{tmat}{3}{3} \tmatpv{1}{1} \tmatpn{1}{2} \tmatpv{2}{2} \tmatlink{1 1}{1 2} \tmatlink{1 2}{2 2} \end{tmat}$
tensormatrix
Metric Tensor
tikzorbital
p_x Orbital