Volkswagen has hatched plans for a second four-door “coupe” model as part of a strategy to shore up its North American and Chinese market shares while providing a suitable addition to its European lineup. To be positioned underneath the recently facelifted CC, the new four-seater is set to form part of the Jetta lineup, joining successors to today\'s sedan and wagon models in an expanded three-model range. They\'re all set to hail from Volkswagen\'s Puebla plant in Mexico, the same site responsible for the newly launched second-generation Beetle. Known internally under the designation SC (denoting “sport coupe”)--a name it is potentially taking into production--the car was recently given approval after U.S. market studies revealed that Volkswagen\'s earlier plans for a two-door version of the Jetta, as previewed by the NCC (New Coupe Concept) at the 2011 Detroit auto show, garnered only a lukewarm response from potential customers. “Our research suggests there is increasingly a market for a sportier and more stylish version of the Jetta in the mold of the CC, only smaller and more affordable,” a Volkswagen source revealed to Autoweek. “From the feedback we\'ve received so far, buyers want an individual body style and the practicality of four doors.” With a three-door version of the seventh-generation Golf due out later this year, together with the Scirocco (Europe) and Beetle, the Volkswagen line is well represented in the traditional-coupe segment. The SC was conceived to compete against an upcoming sedan version of the third-generation Audi A3 previewed at last year\'s Geneva motor show, as well as the Mercedes-Benz CLC, which is due to be previewed in concept form at the upcoming Beijing motor show. The four-door will be first in a new wave of Jetta models to be based on the German carmaker\'s MQB (Modularen Querbau) platform, as found beneath the new A3. The SC will be sold alongside a successor to today\'s larger and more luxurious CC, which is currently undergoing the first stages of development and is set for launch in 2015.