Example written in answer to the question Click How to superimpose pages from existing documents into another document?
superimpose
##GITHUB:https://github.com/itext/itext-publications-examples-java/blob/develop/src/main/java/com/itextpdf/samples/sandbox/stamper/SuperImpose.java##
##GITHUB:https://github.com/itext/itext-publications-samples-dotnet/blob/develop/itext/itext.samples/itext/samples/sandbox/stamper/SuperImpose.cs##
Results
https://github.com/itext/i7js-examples/blob/develop/cmpfiles/sandbox/stamper/cmp_super_impose.pdf