Women have failed to make significant inroads in US boardrooms over the past five years, according to fresh research [by executive search firm Spencer Stuart] that underlines how corporate America is yet to break the “glass ceiling” that prevents female executives rising to the top…[L]arge companies such as Motorola…Expedia…and Urban Outfitters…have no female directors…Motorola said it valued diversity and that its last female director left in May. The group is planning to split into two next year and “each company is working to establish a more diverse board of directors”, it added. Expedia and Urban Outfitters did not reply to requests for comment…Julie Daum, the head of Spencer Stuart’s board and chief executive practice in North America, said the criteria set by boards when hiring new members often made it difficult for women to be picked…[also refers to L-3]