4.4 kitkat - When app is moved to SD card, where is the app data stored on SD card?

My phone (Sony E4g, running Android 4.4.4) offers the possibility of moving some of the installed apps partially onto the (removable) SD-card. I use this feature regularly, and -in theory- quite a big part of the apps are already moved on it. My problem is however that I can't find these anywhere on the SD-card, and there are no separate partitions on the card either. So my question is: where exactly are this moved apps stored on the external storage in KitKat ? Thanks.