(Reuters) - Austrian maker of printed circuit boards AT&S on Thursday reported a 26.9% drop in its half-year core profit, citing a lower rampup of the latest smartphone generation and falling demand in its automotive and industrial segments.Earnings before interest, depreciation and amortisation (EBITDA) in the six-month period came in at 101.1 million euros ($111.8 million) after 138.3 million last year, the group said.Revenue in the period fell 5.1% to 490.3 million euros.The company..