SEOUL (Reuters) – Shares of South Koreas Samsung Electronics extended their rebound on Tuesday, rising as much as 3 percent, as currency concerns subsided. The recent set back in the yens weakness against the dollar and the won has cleared much worries stemming from currency rates, highlighting the cheap valuation of Samsung Electronics shares following a sluggish January, said Park Kang-ho, a tech analyst at Daishin Securities. Shares of Samsung Electronics, the worlds top smartphone maker, rose as much as 3 percent to 1. …