keywords: royce bmw kalbfell resigned heinz
text: Rolls-Royce Boss Steps Down After 5 Months (AP) AP - Germany's BMW AG said Monday the head of its ultra-luxury Rolls-Royce car brand, Karl-Heinz Kalbfell, has resigned to take up "new responsibilities" outside the company, which has been struggling to meet its sales targets for the superluxury brand.