Big bank executives are opening experimental branches which use technology to provide more services in less space than a traditional branch. The pilot programs engineered by Bank of America and Citigroup resemble Apple stores, with employees holding tablets and tending to customers. JPMorgan found its customers headed to branches for advice rather than to simply go to the tellers. So their experimental branches focus on new express banking kiosks – A.T.M.s, with additional functionality and large flat screens – rather than the teller line. JPMorgan is also testing new ways of replacing debit card swipes at A.T.M.s, including technology that authenticates identity by scanning irises and palms.