Tokyo stocks opened higher Tuesday as the yen’s weakness against the U.S. dollar lifted export-oriented issues, while semiconductor-related shares tracked gains in their U.S. counterparts overnight. In the first 15 minutes of trading, the 225-issue Nikkei Stock Average rose 180.77 points, or 0.47 percent, from Monday to 38,360.23. The broader Topix index was up 9.42 points, or 0.35 percent, at 2,733.50. On the top-tier Prime Market, gainers were led by miscellaneous product, marine transportation and transportation equipment shares. At 9 a.m., the dollar fetched 156.22-25 yen compared with 156…