"We need to be absolutely hard core about headcount and cost reduction," Elon Musk said in an email to Tesla's senior executives on Monday, per The Information.Beata Zawrzel/NurPhoto via Getty ImagesThe layoffs at Tesla aren't over yet, says Tesla CEO Elon Musk.On Monday, he announced the departure of two senior executives and the axing of their divisions.Tesla, Musk said, needs to be "absolutely hard core about headcount and cost reduction."Tesla CEO Elon Musk says the EV giant is not done with laying people off.The billionaire announced the departure of two senior executives — Tesla's senior director for charging infrastructure, Rebecca Tinucci, as well as its director for vehicle programs and new products, Daniel Ho — in an email to staff on Monday.The email, obtained by The Information, noted that both Tinucci's and Ho's divisions would be dissolved, with only a few employees getting reassigned.