New Delhi, Oct. 27 -- India and Mexico will sign terms of reference this week to formally launch negotiations for a free trade deal, aiming to shield exports of Indian automobiles, textiles, footwear, plastic, steel, chemicals and toys from recently-imposed high tariffs in Mexico, officials familiar with the details said. Both India and Mexico have already finalised terms of reference (ToR) for a preferential trade agreement (PTA). The two sides will formally sign the ToR in the next couple of days as commerce secretary Rajesh Agrawal is visiting Mexico from Monday, they said, asking not to be named. Agrawal is on a week-long trade mission covering Mexico and Brussels, headquarters of the European Union. The proposed India-Mexico PTA is exp...