One observation that regards the magnetic stipes on the ocean floor that would disprove the theory of platetectonics would be?
These articles about magnetic stripes support plate tectonics. Perhaps your question is worded incorrectly.
http://pubs.usgs.gov/gip/dynamic/stripes.html
http://platetectonics.pwnet.org/story_tectonics/theory/magnetic_striping.htm
http://eqseis.geosc.psu.edu/~cammon/HTML/Classes/IntroQuakes/Notes/plate_tect01.html