Jan 19 (Reuters) - The Indian rupee held on to its gains in afternoon trade on Thursday, hovering around a two-month high, boosted by sustained foreign investor interest in Indian debt and shares. * Demand by oil companies tempered the gains, dealers said. * At 03:30 p.m. (1000 GMT), the rupee was at 50.34/35 to the dollar, after touching a high of 50.07, its highest since Nov. 14. It closed at 50.3750/3850 on Wednesday. * The rupee was helped by a firmer Indian stock market, which took heart from news that the International Monetary Fund was seeking to boost its resources to tackle the euro zone debt crisis. * Foreign institutional investors bought about $3 billion of Indian debt and moved $854 million into shares since the new year began, data from the market regulator showed on Wednesday.

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