217  US 9,323,153 B2  218  In a resin (Aa), a repeating unit (bz) having a group (z)  capable of decomposing by the action of an acid which gen› erates by irradiation with actinic rays or radiation to increase  the degree of solubility with respect to an alkali developer,  includes the same as a repeating unit having an acid-decom› posable group included in the resin (Ab).  The resin (Aa) may further contain a repeating unit repre› sented by the following general formula (III).  In the general formula (III),  group, a hydroxymethyl group or a trifluoromethyl  group, and more preferably a hydrogen atom or a methyl  group.  It is also preferable that the resin (Aa) further contain a  repeating unit represented by the following general formula  (BII-AB).  In the formula (BII-AB),  In the case where each group in the repeating units repre› sented by the general formulae (III) and (BII-AB) is substi› tuted with a fluorine atom- or silicon atom-containing group,  the repeating unit corresponds also to the repeating units  having at least either fluorine atoms or silicon atoms.  Specific examples of the repeating units represented by the  general formulae (III) and (BII-AB) are shown below, but the  present invention is not limited thereto. In the formulae, Ra  represents H, $^{CH}$3, CH 2 0H, CF 3 , or CN. Incidentally, the  repeating unit where Ra is CF  3  corresponds also to the repeat› ing units having at least either fluorine atoms or silicon atoms.  [Chem.47]  (III)  [Chem.48]  (Bil-AB)  Rc 32  represents a group containing an alkyl group, a  cycloalkyl group, an alkenyl group, a cycloalkenyl  group or an aryl group. These groups may be substituted  with a group having a fluorine atom or a silicon atom, or  the like.  Lc 3  represents a single bond or a divalent connecting  group.  Rc$_{11}$’ and Rc 12 ’ each independently represent a hydrogen  atom, a cyano group, a halogen atom or an alkyl group.  Zc’ includes two bonded carbon atoms (C-C) and repre› sents an atomic group for forming an alicyclic structure.  Rc 31  represents an alkyl group, a cyano group or ----CH 2 - 0-Rac2 group which may be substituted with a hydrogen  atom, an alkyl group or a fluorine atom. In the formula, 65  Rac 2  represents a hydrogen atom, an alkyl group or an  acyl group. Rc 31  is preferably a hydrogen atom, a methyl  -continued  [Chem. 49] 