Where do I find the 'Researcher declaration' in Horizon2020?

The ”Researcher Declarations” is even more important in Horizon2020, as reporting is automated (the data from the declarations will be fed directly to the reporting system). The declarations will be electronic. You can find them here e.g.:
http://ec.europa.eu/research/participants/data/ref/h2020/grants_manual/amga/h2020-amga_en.pdf page 430