Several S4D4C researchers have contributed to the Forum on Science Diplomacy which is available in The Hague Journal of Diplomacy put together by Pierre-Bruno Ruffini from the Faculty of International Affairs, University of Le Havre-Normandie, Le Havre, France. You can find the edition here: https://brill.com/view/journals/hjd/15/3/hjd.15.issue-3.xml
His “Introduction to the Forum on Science Diplomacy” is available open access here. He also puts the different contributions by different scholars and practitioners into perspective: some are more conceptual others focus on actors and individuals implementing science diplomacy practices.