Bottom aligned column headers in tabularx

I have a tabularx table with one heading that has a line break so it
expands over two lines. The other headings are, by default, aligned to
the top of their own boxes. How can I make them align to the bottom?

Thanks

Richard

----

From preamble:

\newcommand{\tch}[1]{{\ensuremath{\mathrm{#1}}}}
\newcommand{\ingaas}{\tch{In_{0.53}Ga_{0.47}As}}
\newcommand{\expo}[2]{\ensuremath{\mathrm{#1x10^{#2}}}}

The table (excerpt):

\begin{tabularx}{1.0\textwidth}{Xp{5.5em}@{:}p{4.5em}rl}
\toprule
\bf Layer & \multicolumn{2}{p{10em}}{\centering{\bf Dopant
Concentration/cm$\sp{-3}$}} & \bf Thickness/\AA & \bf Type\\
\cmidrule(r){1-1}\cmidrule(lr){2-3}\cmidrule(lr){4-4}\cmidrule(l){5-5}
n-\ingaas{} & \raggedleft{\expo{3}{19}} & Si & 750 & Cap \\
\bottomrule
\end{tabularx}

.

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