“May a district court properly disregard an expert’s opinion on summary judgment when there is no dispute that the inadmissible facts or data forming the basis of the expert’s opinion are those kinds of facts or data that an expert in the field would reasonably rely in forming an opinion on the subject under Federal Rules of Evidence 703, and without making a factual inquiry and finding as to what data experts in the field find reliable, or affording the proponent sufficient process for defending its evidentiary submission, as required by regional circuit law?”
