2in.of water standing in bottom when finished

Most likely a clog, either along the drain hose, or more likely, actually in the air gap vent. Disconnect the drain hose from the dishwasher and place a bucket under it. Run the drain cycle. This should clear any clog along the drain line. Remove the air gap vent from the top of the sink and disconnect the other hose. Remove the small cap at the top of the vent by pressing the small clips on opposite sides of each other and lift the cap out. Using either a strong flow of water, or, a thin, long-blade screwdriver, remove any debris from the two hose connectors. (Problem is most likely in the smaller hose connector which is preventing water from flowing over to the other connector to drain out). So, during operation, water goes up the small drain hose, but can't go any further and water remains in the dishwasher.

Clearing the air vent cap/filter should solve your problem.