Wie richte ich zwei underbrace-Klammern horizontal aneinander aus?

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\documentclass{article}
\usepackage{amsmath}
\begin{document}
\def\TermI{%
\left[ \frac{\sin\left( \frac{\pi b \sin(\theta)}{\lambda} \right)}{\left( \frac{\pi b \sin(\theta)}{\lambda} \right)} \right]^2
}%
\def\TermII{\cos^2\left( \frac{\pi}{d} \cdot \sin(\theta) \right)}
\begin{align*}
I(\theta) =
I_0 \cdot \underbrace{\TermI}_{\text{Beugungsfaktor}}
\cdot 
\underbrace{\TermII \vphantom{\TermI}}_{\text{Interferenzfaktor}}
\end{align*}
\end{document}
 
 
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