SANTA CLARA, Calif. (Reuters) - Futurewei Technologies Inc, the U.S. research arm of China's Huawei Technologies Co Ltd, began laying off workers on Monday, according to employees including one who spoke to Reuters as he left the company's Silicon Valley campus.At least half a dozen staff with boxes were seen leaving the office before noon. The layoffs come about two months after the Trump administration put Huawei [HWT.UL] on a trade blacklist, making it illegal for its U.S. subsidiary to..