I would like to share the working paper: "Cities and Spatial Interactions in West Africa”, published in the OECD West African Paper series, which can be downloaded at: http://dx.doi.org/10.1787/57b30601-en.
The paper presents a geo-spatial analysis of urbanisation dynamics in West Africa based on Africapolis data (http://www.oecd.org/swac/topics/africapolis/) and may be useful for the preparation of the SOFA report.
Philipp Heinrigs