Latex: How to create subfloat figures (two in first row and one below)

\begin{figure}

\begin{minipage}{.5\linewidth}
\centering
\subfloat[]{\label{main:a}\includegraphics[scale=.5]{example-image-a}}
\end{minipage}%
\begin{minipage}{.5\linewidth}
\centering
\subfloat[]{\label{main:b}\includegraphics[scale=.5]{example-image-b}}
\end{minipage}\par\medskip
\centering
\subfloat[]{\label{main:c}\includegraphics[scale=.5]{example-image-c}}

\caption{my fig}
\label{fig:main}
\end{figure}

http://tex.stackexchange.com/questions/64858/how-to-create-subfloat-figures-two-in-first-row-and-one-below