said Tuesday it will eliminate at least 40,000 jobs, mostly through layoffs, as it restructures into three independent companies. The majority of the cuts will affect the new communications company, which will retain the AT&T name and provide long-distance, cellular and credit-card service. About 70% of the jobs are expected to be cut this year; layoffs will begin this month. More than half of the jobs to be cut are white-collar positions, including many in marketing. A buyout offer to supervisory employees that expired Friday will now be extended to other employees to help decrease the number of layoffs needed. About 6,500 of 72,000 supervisory employees who were offered the buyout package in November accepted the deal by Friday's deadline.