The corporate structure is in reality very simple. Norbert Haug is a vice president of Daimler AG where he is responsible for all motor sport activities of the corporation. He reports directly to Dieter Zetsche. He joined the predecessor Daimler-Benz AG in 1990 in the same function as head of motor sport activities. At that time he did not hold the title of a vice president of the parent corporation though.
Norbert has two UK companies reporting directly to him. The engine and hybrid drive company Mercedes AMG High Performance Powertrains Ltd. in Brixworth and the Mercedes AMG Petronas Formula One Team in Brackley. Beside the UK companies a number of German departments and projects also report to Haug in his function as a Daimler executive board member and VP.
The only significant anomaly in the hierarchy is Ross Brawn. He is the team principal with regard to the F1 legal structures at the FiA, FOTA and FOM and a significant share holder of the team company. He isn't reporting directly to Haug AFAIK in many of these roles. They are both board members of the team. Norbert and other board members exercise the voting power of Daimler AG and Aabar in the team board meetings. So on this level there is a cooperative and not a reporting structure in place. Due to the share representation of Brawn, Daimler and Aabar you can be sure that any discrepancy in strategy or policy will be resolved according to the Daimler view. You can also assume with some certainty that Daimler have a water tight option on the Brawn shares when he retires from the company.
All employees of the two British companies will have appropriate reporting structures and responsibilities according to UK company law.