AMS, which supplies Apple with sensors for its Face ID technology, has reported a 58 percent decline in fourth quarter core profit, its guidance and the suspension of a dividend payment for 2018.The Austrian group decided against giving a full-year earnings forecast after a downturn in 2018 results, saying shorter order cycles reduced visibility in a difficult market environment, reported Reuters.However, this sent the stock down 15 percent.The shares tumbled 75 percent last year while the European sector index lost 11 percent and Apple shares 9 percent.”Given a market we are seeing that is very volatile and hard to read and also demand that is smaller than we had envisaged, we see first quarter sales of $350-390 million,” Chief Executive Alexander Everke said at a news conference in Zurich.