\begin{tikzpicture}%
\node<1-> (X) {\includegraphics[width=275.72208em]{layerexample_layer1}};%
\node<2> (X) {\includegraphics[width=275.72208em]{layerexample_layer2}};%
\node<3> (X) {\includegraphics[width=275.72208em]{layerexample_layer3}};%
\end{tikzpicture}%
