EA Team Structures

How are EA teams structured? Many smaller organisations do not even bother with teams, yet have good EA practices in place. In my experience it does help in a large organisation to have some team structure and processes in place to deal with the multitude of interactions with the IT and Business departments. Typically there will be an architect per domain, e.g. an Information architect, a Security architect, one or more Application architects, etc. These might all report to an Enterprise Architect or Chief Architect. In my organisation all architects and enterprise architects report to the Chief Technology Officer and there is no Chief Architect.