I have a complex tabular, with nested arrays within some of the cells.

I want to increase the spacing of between the rows of the outer tabular,

but, e.g., \\[2ex] doesn't work. I've tried adding struts at the end of

each row, and fiddling with \arraystretch (where I can't seem to increase

the outer, without also increasing the inner arrays).

What can I do to fix this? I show it in the most basic form.

\documentclass{article}

\usepackage{bm}

\newcommand{\mat}[1]{\ensuremath{\bm{#1}}}

\begin{document}

\newcommand{\T}{\scriptstyle}

%\newcommand{\strutt}{\rule{0pt}{2ex}}

%\renewcommand{\arraystretch}{1.2}

\begin{tabular}{p{.4\textwidth}p{.55\textwidth}}

\hline

\multicolumn{1}{c}{Hypothesis} & \multicolumn{1}{c}{Model specifications} \\

\hline

A. $H_{=\Sigma}$ : $\Sigma_1 = \Sigma_2$ &

$\left \{

\begin{array}{l}

\mat{\Lambda}_1 = \mat{\Lambda}_2 = \mat{I}_{(4\times 4)} \\

\mat{\Psi}_1 = \mat{\Psi}_2 = \mat{0}_{(4\times 4)} \\

\mat{\Phi}_1 = \mat{\Phi}_2 \mbox{ constrained, free}

\end{array}

\right. $

\\[2ex]

%

B. $H_{k=2}$ : $\Sigma_1, \Sigma_2$ both fit with $k=2$

correlated factors &

$\left \{

\begin{array}{l}

\mat{\Lambda}_1 = \mat{\Lambda}_2 = \left[

\begin{array}{cc}

\T{x} & \T{0} \\[-5pt]

\T{x} & \T{0} \\[-5pt]

\T{0} & \T{x} \\[-5pt]

\T{0} & \T{x}

\end{array}

\right] \\

\mat{\Phi}_1, \mat{\Phi}_2, \mat{\Psi}_1, \mat{\Psi}_2 \mbox{ free}

\end{array}

\right. $

\\[2ex]

%

C. $H_{\Lambda}$ : $\mat{\Lambda}_1 = \mat{\Lambda}_2$ + $H_{k=2}$&

$\mat{\Lambda}_1 = \mat{\Lambda}_2$ (constrained)

\\[2ex]

%

D. $H_{ \Lambda , \Theta }$ : $\mat{\Psi}_1 = \mat{\Psi}_2$ + $H_{\Lambda}$ &

$\left\{

\begin{array}{l}

\mat{\Psi}_1 = \mat{\Psi}_2 \mbox{ (constrained)} \\

\mat{\Lambda}_1 = \mat{\Lambda}_2

\end{array}

\right.$

\\[2ex]

E. $H_{ \Lambda , \Theta , \Phi }$ : $\mat{\Phi}_1 = \mat{\Phi}_2$ + $H_{

\Lambda , \Theta }$ &

$\left\{

\begin{array}{l}

\mat{\Phi}_1 = \mat{\Phi}_2 \mbox{ (constrained)} \\

\mat{\Psi}_1 = \mat{\Psi}_2 \\

\mat{\Lambda}_1 = \mat{\Lambda}_2

\end{array}

\right.$ \\

\hline

\end{tabular}

\end{document}

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