double.sided — Is the document to be printed double sided?
This parameter is useful when printing a document on both sides of the paper.
if set to non-zero, documents are formatted using different page-masters for odd and even pages. These can differ by using a slightly wider margin on the binding edge of the page, and alternating left-right positions of header or footer elements.
If set to zero (the default), then only the 'odd' page masters are used for both even and odd numbered pages.