CHENGDU, China, Aug 30 (Reuters) - Daimler AG's Mercedes-Benz will try to reach deeper into China's inland-west region and small "lower-tier" cities for growth as part of a broader turnaround plan for the world's biggest auto market, according to people familiar with the matter. The initiative, due to be detailed by top Mercedes-Benz China executives at the Chengdu auto show on Friday, is a key component of Daimler's strategic plan to invest 2 billion euros ($2.67 billion) in China over the next two years. The German brand aims to boost sales of Mercedes-Benz cars by a third to more than 300,000 cars a year by 2015, from this year's forecast sales of 230,000 cars. If achieved, the target would make China Mercedes-Benz's biggest market globally. Currently, China is the brand's No. 3 market behind Germany and the United States.