Li &etal; found that the critical current densityJcJacross atomically cleanc-axis twist junctions ofBi2Sr2CaCu2O8+&dgr;is the same as that of the constituent single crystal,JcS,independent of the twist angle&fgr;0,even atTc.We investigated theoretically if adx2−y2-wave order parameter might twist by mixing indxycomponents, but find that such twisting cannot possibly explain the data near toTc.Hence, the order parameter contains ass-wave component, butnotanydx2−y2-wave component. In addition, thec-axis Josephson tunneling is completely incoherent. We also propose ac-axis junction tricrystal experiment which does not rely upon expensive substrates. ©1999 American Institute of Physics.