European stock markets are expected to open lower on Tuesday, with investors focusing on upcoming corporate earnings reports and Federal Reserve developments. The Ibex 35 index in Spain is starting the day near 13,555 points, slightly above the previous level of 13,518 points, which was its highest since May 2008. Key companies to watch include Indra, which has already released its financial results, as well as Philips, Zalando, Continental, Covestro, and Hugo Boss. Futures for the Ibex and Wall Street indicate a modest decline ahead of the market open, reflecting cautious sentiment among investors.